Brushless drive ESC

[mattsdragons]

It seems to be the next thing with powerful brushed stuff being more awkward to get hold of in the UK, had a look at various ESC's and these seem to fit the bill but wanting other opinions?

http://www.hobbyking.co.uk/hobbyking...Truck_ESC.html

[typhoon_driver]

Won't work. You need an esc and motor with closed loop feedback so that the esc knows the exact poisition of the poles in the motor.

[mattsdragons]

Something more like this?

http://www.hobbyking.co.uk/hobbyking...Truck_ESC.html

[typhoon_driver]

oh and there's no way that thing is taking 700 amps or whatever it's spec'd to. Those are hobby amps, not genuine. Also bear in mind that these esc are made with relatively lightweight models, not our 30lb machines.

[Shakey]

Won't work. You need an esc and motor with closed loop feedback so that the esc knows the exact poisition of the poles in the motor.

A non sensored ESC still has feedback through the use of back EMF normally. It is prefectly possible to use sensorless brushless setups and still have good performance. You'll just experience less smooth startups.

[mattsdragons]

700 amps is laughable, it seems entirely possible to do so may be worth a bit of exploring

[mattsdragons]

Ah okay, makes sense. Still learning about brushless myself, glad to have the pointers

[typhoon_driver]

yes as long as the motor is a sensored motor. However I'm not familiar with the ins and outs of using a brushless for drive. As far as I know it's only been done successfully either on the continent or in the states

[Shakey]

yes as long as the motor is a sensored motor. However I'm not familiar with the ins and outs of using a brushless for drive. As far as I know it's only been done successfully either on the continent or in the states

You're wrong, back EMF can and is read from a sensorless motor. Back EMF is read from the inputs to the motor. I am actually leaning more towards sensorless setups in fighting robots. Sensored introduces more parts/components so more potential things break and often they are simple optical sensors and under certain conditions can fail (generally not built for robots tumbling all over the place). Part of my lean towards sensorless brushless is the entire motor becomes a single moving part with just windings and magnets. Not much to get knocked about and fail.

EDIT: The 700 Amps is probably the combined peak rating of the FETS. Wouldn't fully trust that.

[maddox10]

Don't try to small a motor. A 28mm won't do.